It's cloudy ... its windy ..is it going to rain?? oh gloomy day....and all of a sudden the sun emerges out and lo! you have your whole surrounding swathed in its warm sunshine...
So very like that, your mood is in the dumps, depressing weather to top it, but all of a sudden you remember someone, recollect something and without realising you are smiling...:) One moment you are feeling in great despair and the next moment something happens that makes the world look beautiful, bright and happy.
Now that is what I call magic! :)